1623445 has 4 divisors (see below), whose sum is σ = 1948140. Its totient is φ = 1298752.

The previous prime is 1623437. The next prime is 1623451. The reversal of 1623445 is 5443261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5443261 = 1049 ⋅5189.

It can be written as a sum of positive squares in 2 ways, for example, as 651249 + 972196 = 807^2 + 986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1623445 - 2³ = 1623437 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162340 + ... + 162349.

It is an arithmetic number, because the mean of its divisors is an integer number (487035).

2^1623445 is an apocalyptic number.

It is an amenable number.

1623445 is a deficient number, since it is larger than the sum of its proper divisors (324695).

1623445 is an equidigital number, since it uses as much as digits as its factorization.

1623445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324694.

The product of its digits is 2880, while the sum is 25.

The square root of 1623445 is about 1274.1448112361. The cubic root of 1623445 is about 117.5292216442.

The spelling of 1623445 in words is "one million, six hundred twenty-three thousand, four hundred forty-five".